(T) Fiat Ducato 160 multijet maxi

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I need a a lot of info i think, I have a fiat ducato 160 multijet maxi 2007(57) plate, about 2 years ago the engine management warning light came on and was told by filling up a couple of times this would solve the problem as it may be water in the fuel(Problem solved it worked) warning light back on but this time have fueled up a couple of times and light still on with another problem,
the engine is starting to cut out for a spilt second then its fine for a time,sometimes all day and the next day this may happen 4/5 times

I can't see how filling the tank would get rid of the problem of water in the fuel. Water and fuel don't mix and since the fuel is less dense any water will collect at the bottom of the tank. Once there it's going to stay there until the tank is drained and if the water level reaches the pickup pipe it'll get into the fuel system which will do the HP pump no good at all. I'm not familiar with the system on your model but there would normally be a water trap somewhere in the fuel line from the tank. If not maybe this function is combined with the fuel filter. If significant water is found in the trap or filter you need have the system purged of water.

If the engine management light is on there should be fault codes stored in the ECU so I would advise you to get a diagnosis carried out.

Cheers for the info, I have booked my van in for a test and a full service, Once treatend with a garage i put more fuel in and the van gave a big dip (Cut out) and then picked up again within 1 minute the light had gone off and the van is running fine, I will post results once i have them.